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This question already has an answer here:

I just changed my Minecraft gamertag and it was all ok, then when I try to join a server it says this "Failed to join server Error: Authentication to Minecraft.net Failed"

marked as duplicate by Studoku, galacticninja, Frank, 5pike, Tharius Oct 4 '15 at 13:50

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    Log out of the game and the launcher, then log in again and all should be good. – GiantTree Jul 15 '15 at 2:11
  • Hey @GiantTree, please post answers as answers and not as comments, this time, someone did it for you, but do it yourself next time, so you can take the reputation etc – Ave Aug 12 '15 at 13:26
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Simply re-login to the Minecraft launcher. If this does not work, you may need to update the launcher here.

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